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QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Introduction

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QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Introduction QSG175: Silicon Labs Direction Finding Solution Quick-Start Guide Bluetooth version 5.1 introduced support for Direction Finding to provide a standard protocol for radio-based Real Time Locating KEY POINTS Systems (RTLS). Silicon Labs not only supports this feature in • Stack support for Direction Finding its Bluetooth stack, but it also provides a reference • RTL library implementation of a Real Time Locating System running over • Architecture Bluetooth. This guide walks through the offered solution to help • Demos and Examples anyone get started with Direction Finding. silabs.com | Building a more connected world. Rev. 0.4 QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Introduction 1 Introduction Bluetooth 5.1 introduced support for Direction Finding by adding the option to send and receive Constant Tone Extensions (CTEs) after Bluetooth packets. This makes it possible to do phase measurements on antenna arrays and ultimately to determine the direction of an incoming signal. To learn more about the theory of Direction Finding, that is how to determine the direction of incoming signals, see UG103.18: Bluetooth® Direction Finding Fundamentals. Readers of this document should be familiar with the basics and terms of Direc- tion Finding. Beginning with Bluetooth SDK v3.0, Silicon Labs’ Bluetooth stack supports CTE transmitting and receiving features and can take phase measurements on the incoming signal as specified by the Bluetooth standard. Note, however, that the determination of the angle of incidence from the phase measurements is outside of the scope of the standard and must be implemented in the application. To reduce the Time to Market for its customers, Silicon Labs also offers a reference implementation of a Bluetooth-based Real Time Locating System (RTLS), which provides both an out-of-box experience to evaluate the solution and a flexible framework that makes it possible for every- one to create their own RTLS. To get started with the reference implementation, refer to AN1296: Application Development with Silicon Labs’ RTL Library. To find the API Reference Manual for the RTL library, visit https://docs.silabs.com/. The link for the RTL library is under the Bluetooth section. It is of course also possible for anyone to use their own direction-finding algorithm on top of the Bluetooth stack. This requires deep knowledge in Direction Finding but enables even more flexibility. If you choose this approach, see AN1297: Custom Direction-Finding Solutions using Silicon Labs’ Bluetooth Stack. The Silicon Labs Direction Finding solution is part of the Bluetooth SDK. If you are not yet familiar with the Silicon Labs Bluetooth SDK, start with the following document: QSG169: Bluetooth® SDK v3.x Quick-Start Guide. Finally, either you use Silicon Labs’ Direction Finding board or your own design. AN1195: Antenna Array Design Guidelines for Direction Finding provides you with useful information regarding antenna design. It also provides accuracy measurement results of the RTL library used with Silicon Labs’ Direction Finding board. silabs.com | Building a more connected world. Rev. 0.4 | 2 QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Demos and Examples 2 Demos and Examples Silicon Labs provides both hardware and software solutions to make the evaluation of the Direction Finding solution quick and easy. Using a Direction Finding radio board along with a Wireless Starter Kit (WSTK) as a locator, and a Thunderboard BG22 as a tag, you can easily set up our demo environment, which shows you the capabilities of Bluetooth-based Direction Finding. To get started with Bluetooth demo software, you should have downloaded Simplicity Studio 5 (SSv5) and the Bluetooth SDK v3.x as described in the Simplicity Studio 5 User's Guide, available online and through the SSv5 help menu. The Bluetooth SDK comes with some prebuilt demos that can be flashed to your EFR32 device and tested with the appropriate tool as described in this section. If you are new to Silicon Labs’ Direction Finding solution, it is worth starting with setting up this demo. 2.1 Demo The demo comprises three demo applications: • The Bluetooth – SoC AoA Asset Tag demo app is a prebuilt version of the sample app with the same name, and it is to be run on the tag that you want to follow. • The Bluetooth – NCP AoA Locator demo app is a prebuilt version of the sample app with the same name, and it is to be run on the antenna array board (Direction Finding board). • The AoA Analyzer tool is a Java based application, built into Simplicity Studio 5, that showcases the angle estimation skills of the RTL library in a graphical user interface. It is intended for demo and evaluation purposes and follows a simple architecture as shown in the following figure: Running the demo requires the following devices: • An EFR32xG22 part, preferable on a Thunderboard BG22 • A BRD4185A antenna array board with a WSTK • A PC running Simplicity Studio 5 with Gecko SDK Suite v3.2 or later silabs.com | Building a more connected world. Rev. 0.4 | 3 QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Demos and Examples 2.1.1 Set up the Antenna Array Board To set up the demo, first install software on the antenna array board. 1. Start Simplicity Studio 5. 2. Attach the antenna array board to the PC. 3. Select the antenna array board (Direction Finding board) in Simplicity Studio Debug Adapters view, and make sure that Gecko SDK Suite v3.2 (or later) is selected as Preferred SDK. 4. Select the Example Projects & Demos tab, filter for Bluetooth technology type and find the Bluetooth – NCP AOA Locator demo. 5. Click RUN to download and run the demo on your board. (Note: the demo also includes a bootloader. If you build the AoA locator application from source, a bootloader must also be flashed to the device.) 2.1.2 Set Up the Tag Next, install software on the board with an EFR32xG22 part (the tag). 1. Attach a Thunderboard BG22 or any other radio board with EFR32xG22 part. 2. Select the board in the Debug Adapters view, and make sure that Gecko SDK Suite v3.2 (or later) is selected as Preferred SDK. 3. Select the Example Projects & Demos tab, filter for Bluetooth technology type and find the Bluetooth – SoC AoA Asset Tag demo. (Note: The demo is only available for Thunderboard BG22. For other boards the example project with the same name must be built by the developer.) 4. If this is a new Thunderboard, push its reset button. On some boards the factory default firmware puts the device into EM4 sleep mode after 30 seconds, and then the device must be restarted to be accessible by the programmer. silabs.com | Building a more connected world. Rev. 0.4 | 4 QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Demos and Examples 5. Click RUN to download and run the demo on your board. (Note: the demo also includes a bootloader. If you build the AoA Asset Tag application from source, a bootloader must also be flashed to the device.) 2.1.3 Start the AoA Analyzer Tool Finally, start the AoA Analyzer tool in Simplicity Studio 5. 1. Right-click the antenna array board (Direction Finding board) on the Debug Adapters view in the Launcher perspective of Simplicity Studio 5. 2. Select AoA Analyzer in the context menu. The tool is also available through the Tools selection in the Simplicity Studio toolbar. 3. The analyzer opens, connects to the antenna array board, finds the asset tag near you, and displays its direction relative to the antenna array board. 4. Move around the scene with your mouse to get a better view on the board, and finally move around your tag and see the right arrow following your movement: silabs.com | Building a more connected world. Rev. 0.4 | 5 QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Demos and Examples 5. Expand the Assets window in the lower right to see the logs by clicking the icon next to Assets.. 6. Open the Settings window by clicking on the gear icon. In general you would modify these settings after you become more familiar with the Direction Finding solution. 7. The application supports multiple tags, so if the Bluetooth – SoC AoA Asset Tag application is flashed to multiple devices, the AoA Analyzer will display each direction with multiple arrows. If the AoA Analyzer gets stuck right after starting, try resetting the board. If that does not solve the problem: 1. Open Simplicity Studio and, in the Debug Adapters view, right-click the antenna array board (Direction Finding board). 2. Select Connect. 3. Right-click the device again and select Launch Console. 4. Select the admin tab. 5. Check the serial vcom settings with the command serial vcom 6. Change the serial vcom settings to use CTS handshake mode serial vcom config handshake CTS 7. Now re-try running AoA Analyzer. If it still does not work, upgrade the WSTK to the latest firmware version through the update functionality on the Launcher perspective’s Overview tab. 2.2 Application Examples As part of its reference RTLS implementations, Silicon Labs provides multiple sample apps that demonstrate the usage of the CTE Transmitter and CTE Receiver features and of the RTL library. While the Demo is focusing on Angle of Arrival calculation only, the sample apps demonstrate both Angle of Arrival calculation and position estimation, using multiple locators. silabs.com | Building a more connected world. Rev. 0.4 | 6 QSG175: Silicon Labs Direction-Finding Solution Quick-Start Guide Demos and Examples The sample apps follow the software architecture shows in section 4.1 Overview: • The Bluetooth – SoC AoA Asset Tag sample app running on the tag demonstrates the CTE Transmitter feature.
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